"Ego" is the second official single from girl group The Saturdays' second studio album, Wordshaker, and their seventh single overall. The song is a strong electropop song. The song was written by Steve Mac and co-written by Ina Wroldsen and Rhys Barker, who has previously worked on the band's singles. The song was produced by Steve Mac. It was released onto radio station on 25 November 2009.

The single was released by Fascination and Polydor Records on 3 January 2010 as the second single from Wordshaker. It was accompanied by a B-side entitled "Flashback", written and produced by Steve Mac. The Saturdays collaborated with Ina Wroldsen and Rhys Barker again, The song has prominent electropop, dance-pop and synthpop genre characteristics. Its lyrics refer to a former relationship with someone who has a big ego.

The music video accompanying "Ego" was directed by Mike Simpson and Robin Van Calcar and premiered on YouTube on 17 November 2009. The video features The Saturdays in superhero outfits, many meetings where the paparazzi are trying to interview a member of the group. "Ego" was performed by The Saturdays as part of their setlist on the Headlines! Tour. The band also appeared on Dancing on Ice, GMTV and Blue Peter.

In an interview with HitQuarters, Steve Mac described how he, Ina Wroldsen and Rhys Barker created the track together,

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